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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac7a360f3da1445b20b83801055def0c0c88c562bc1720c6b255ea0d93dcfe5' 
  AND token = 'lE9OckunVZsY4Rt4iVKU7HM3+LBJRmyZX2WD+Yqpys0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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