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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07596397d60b40d38cb566b1b5381e89376b87616163cab1e2a1a02de0558446' 
  AND token = 'F4k7jRpZbkUqMx1Frz/dfmDhCfZnOkByPKPG752qs+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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