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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86857559e5628284506bbd7a9c89d97e4de284243f27a0eef8f3febd7ee58188' 
  AND token = 'JqJUNtwc83mqge1PndKToq2g0r3VkisfoVV9+Men4YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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