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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd69740e77f61ddd04cea06532ac9e63c0392faecd8673736be409050fea33e' 
  AND token = 'TWy52DNp+0hyi/yRiUa5TJAvEOtMAZvDs/3LGIvy9n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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