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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4642b7830c008f27135b30e8e054759d57447894c669d3036d3b27bd3e0500' 
  AND token = 'tgud4h4Ath3VXutu6q3jeveldir/jORh1qiJiZ4D8KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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