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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3887c437fdf92a3a0355d98089f76036147c3427dd34c450792a8fed570e6328' 
  AND token = '0/NueFeRt0ipLiURjBv5MDYk8P2NnRkr5IuKBP/FeJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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