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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88640ee4db17ff98ba3dd758e91fe77046b09b0d67b9c52b648d5d735f97323e' 
  AND token = '/twMSQYj5UCLsylOAKfthyurRdd0YBxceGjV9YooSlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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