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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf69680ff1b40ef099cd288bcbb96432e6703304ef2e14f656fcb58a87107e60' 
  AND token = 'R7HcZcJEYilK1fymH0NYrSpuVZ4k9pd+X2AFrIa4B7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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