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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e51deef56a8d403e5bab499d3b5648c132951a3d4c463490414f9d6d5707caa' 
  AND token = 'jY9dCvRbtl7w7SIWmUvMfcX0OIL+XTmZK57dVc6Oobs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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