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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6e317cc6d7223500b10f61acd4eeda217634e10f716f1eae8bd7c2708da8e8' 
  AND token = 'gihHjIHqJ1j08XHxYFOtKujMNDE9XgEhGPMqoq39sSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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