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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d12e644e87737058784f5d4ce4c84056550599f742dcddf36530da32f6f313' 
  AND token = 'h19giBwO/ecQ3Z45Xlh6xeY2ND6ceaFuw6Uj7EbirjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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