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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5960f247a1eed63ddc8d108d7dad90b38943a7ecb8a3455f2d627714866fc6' 
  AND token = '11f20i+90GjwB5lKcM6RAwda8aSf85H+vsHmAo4iYFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}