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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3c913ff2207b83be4c39ed3bfd20deaf25a2e383ea5420112ea8c3e3480238' 
  AND token = 'sTfQGHwwlqkWp+lk7xrLIcRpIDru9uoafzA+FF9H2UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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