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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb34ff253a068753dc0a0de3747907730b046c72e6297cd540a37a05e4ed4582' 
  AND token = 'E3ZcgleerNM897767My7k1L48nE4xzN6OJ2scTyKthw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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