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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9458cdf44701e338fa596c0e9ce6c60a5cb6d279c8b3bc90705b00f9c4ddff0' 
  AND token = 'gQPazhOiPgd1CG5vyJ+ewbKfLTl0ZkvkgYWvmK6boN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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