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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b939f553415cda0dfc7a4268da90e017635f4b96280bb2db449cf4fef8e78771' 
  AND token = 'tpnsSDhZrykZkRDOhcfDmuChh8SZU2DeFoKE6a718Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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