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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7588cf9552f7e8819179ba6a33a65fbcb07ffe792c50173ecfc3bb0ab9cf3b5f' 
  AND token = 'IBxW/ZF2+Sh/AuHvR7xwHagKBK/bZ71Q4cAMsII9rm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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