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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b34f7ae7fe40e8ca5091132f2a9527eaada60f93b3207523c3306a5ab998b6' 
  AND token = 'aXmkeq1vI3Bg1srcz4xtQHMmeE8nJNdc9ULBYtAKiqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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