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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ca28dd168c4dc6c66c3bd10a429ef749e584cb163c20d131e2c8bc712373f5' 
  AND token = '4jC0V5vuH4i9fROuQlKk+85miaeDT4VZ6u1PJ+7/MXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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