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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6644f201666388f12eb686678ceba950a1969d177d5d6ccf477f7031fc60bf0c' 
  AND token = 'nQBVNgue3tb4QMw2YxlqxlBoC1wiYbYfOLWJHSX6gbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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