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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8276eb2e60dbcca5205377706a6ba53c28b95109f6097be87f38ba9e810cd117' 
  AND token = '5/TW52DpjRd7L/k/eIkmSO3T5i0AwUr9neXt4k8ohlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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