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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f810ebe36067869c3708e9cac0b9ebc57cceb666d6d77a23a82aca14ff04941a' 
  AND token = 'cXpdhKol4duER0i0w/OJvCUumx11ZfwSyw7m6ZqidbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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