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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9daa4e788e90b77691bb36fc52aacfc8dc03fcf6f4db47bda3cece0cca03c1a5' 
  AND token = '1PfPc17EjT1ZBa+Soy1VQTNNoKCOvRR8BnuyPeK6rP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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