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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb0b47d6282e80e504cee506924688785a1fc5d79ae902d855808122a4040e6' 
  AND token = 'M/DjJ4/K+nzl56k9xy3427efyqNgLCoI74DYZESiYIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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