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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bdce299c4384f7eaa270049dcf8902b2d6ce5ef638c88c067cbb0c74c36843' 
  AND token = 'AAT0rFU82LbOWjHspWB0ITw++wpJsNmXkSju/I/Lvr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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