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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3429d4b2ac9208414623b47a4fb0cf8c73d9df92abde34c0a0c0ac390f190f28' 
  AND token = 'QsOVNg0Wr6Ywy0SotPVcC+qeOaP6tE+WmCpcWaeEARs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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