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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa072a9d91fd5f8ffdce105339ae08b396ce0cd3316c87f2a105699e8c40912' 
  AND token = '2HzV2eEn5hdfbPI8Z3F84elDP3Oowp/2RgC8BP8E+/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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