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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb6309280bde908a2088b9957e3c33a40a6c9069d9345102cf5f09a1ae627e8' 
  AND token = '6pyNYgs7ZpGVHGWbXUXai7oTnlZnt9Inp+w2gNrtMCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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