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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b00fd62e2c7d969b8ba75a6e7b0e9ad31b44e7dc61d603ac074b342acce8f2' 
  AND token = 'AwLKMUoZsTWS5ISzFFSWqFcWlT+1WJl2Bqfz+kKQUU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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