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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8142adb4f190212a1683e027279676c1fe021b58ae89f1719e2fc11380ce0d19' 
  AND token = 'dWyUBuqjrwC2BjSsVCHKtTrUU0WUJIc8KtWwLzz8ArY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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