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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585699f493cae89d4dfcc178c32eef47dba38b3b83eeee75a1c8bb77895e7e52' 
  AND token = 'acHRwfEiSLw3QD5qyv4voFnQikvmWxjJxvdFRbO9h88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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