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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc8909c1af323f693402e05796ebbcfed480d9be17adac65c9157f2d4cef12c' 
  AND token = 'R9UWchLQo29GObQfQY9o4hmDhk1QYHYaIDitt90oWq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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