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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030938557773957c0abf97e66522b3f09b153f9795926bfda5c3d7a8d853841e' 
  AND token = 'AW+yLxXKlkaPmtoN9JFd6gIcX3uK51uwHhVS2JqLPaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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