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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04896f6d40dd6fcf660e7898e64dbda889533a58507610c68756b7e5c48e5fa' 
  AND token = 'HUfNyVohfBYGJnDV9wKhyhokCTfl1OASSpCRbnnjfO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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