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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067a047f32c6b6ad58d0da84eaf19d31d8d6ea8aa8e33d1648e3f27bbdf3c7f0' 
  AND token = '/hZXfqtRN+TJiei8WeTh49JvjyWHot0LPNLqkSNF4rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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