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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096caf64aaa77a3a42a85ec3387e4effe88e6966188fa5142fdf2b71ce9b0a24' 
  AND token = '9ud5HTSIfcTHC5PgcuWJPYcc3G+8GHWFG8G7QtkdNaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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