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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3033e61a3e8c90374aa69c0594a1517a4f41ce7b7c76138b12712800f3eec8' 
  AND token = 'G+Qb7H4qtpfaIKcu5bR4GSzQt+UzDnzyr5nu7lnR/DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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