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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3009978c546e72bdb7d8e91f6a91d04396a2ccc334eef79d8a80b51204790234' 
  AND token = 'hji0Xks3Z+WFejVnfi4pdawE8Oplz/clo2LXzkOq8xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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