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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8632cb6cb166c9fd55d07af9d4bd7fd3ba8d171265adad10cef02f9182f71da6' 
  AND token = 'aHRkwzspKWIqHOHYIGcAgRH5gNNLYR6TSO6d8pNbcLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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