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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1e64084665aa82def06667a81e286eecdd4920c5918f133864c9f6d84102e0' 
  AND token = 'WfQ/pSeCQLcKalhtURqDqcqzDDDCU+99Woem5SHabAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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