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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f28170d933029ed005831f0d15ae8e64ad686b2ddc78730b7eb9bd9f5fc0308' 
  AND token = 'lNJTfVkDTyExfgph8W69Otnm/6aKYBsi5ttdov4gY7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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