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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b328a4cf808ef767a704224b172b98f99e055bfda7a828732d7beefae468108' 
  AND token = 'px64BEyxRI5Hu8nnRFH5qoOF0CJGaL4WoFGvVmTLcYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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