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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c582ebd876f364902a422d5dacc36fd9ff3f8bff60c54f1b79b74522feda7e' 
  AND token = 'xw/voGSAr+4QzMvcBWp+w9bkR9E6BeyBMJfzJG1MObU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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