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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a5e24c1fc16d6080b932359ad563ba97514adcc3a4d5070ec4fd4ab16112f9' 
  AND token = 'BwuL2kcIcAh1VfCkjxvlqtJ4Gf+3nq8UsVvWbrbl1Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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