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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105c44fb4ee29b120d2dfdc75277485e7eedc3391862a5b55c74223e521b7b67' 
  AND token = 'ByuoJoANlc8mQByhg6dsSC44JQ0MiPjT2hngk8QxHFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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