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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c01c4f554e4e5763eef59c4831dd79eb9035c7a803eee1397d7c272abb6bee' 
  AND token = 'qtyTvwuQayDYPJB/cYRmiTEvI9+Eq1ravQPhtv1XZLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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