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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd549f0e8c2c78508bd4280d1cf6c397e88a9531928f1ea88f0add64227a43e9' 
  AND token = 'k548lQqEvAFVsYIayj8SifRqAsw8H9/+l7hZdVbf0ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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