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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecf37a57604b8b4b9a95ff31c69b8ba056d31c8826890c017299efa8e7d5b1c' 
  AND token = 'WC+zaByJuvZ9sb/k2USnDz4M1SYIiFWYEscUhzXefLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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