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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce04ade0e23b98acc7d7c18418f493ca90e94de89312b2487c8b0ced916c8c92' 
  AND token = 'oIwOhJzmTRVhDhSFIz6o3rBhXp6KBgxh2N2+1cxlGyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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