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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a0ade94ace1536d4f11db3c11d01a770e8316648a992ec8f4738d9c205839e' 
  AND token = 'OQWfgkc6hCd5wqRwyFJZ3PJBa1SwP9mJxwIfzc9S3V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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