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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4670582b313d1e96ded21e0d12c620a267f38552d7b39b67499e7c37a75649' 
  AND token = 'zJ7OUqaN6M9d4W/5F6cnGzkx9k8H6wxuOGlcdkXMNQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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