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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1392c7dc464288b3b0a5d4096c47f117f03e0547dfbf043ec9331871aebf9e00' 
  AND token = 'qps7MMQQbXQrPNncQiEi/SzesT72GgF+xzVgPfQFrZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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