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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a4598a490e1d350f1867c1beb429345b1119ed5057c655649011f68f1d0353' 
  AND token = '/AHGPipHj6NAdZSx0alGDqmMoMZLr5dxwnr1vw0wNv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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